Game of Thrones alum Sophie Turner has joined the ever-growing cast of HBO Max’s true-crime limited series The Staircase, exploring the life of Michael Peterson, according to Deadline.
The Max Original is a co-production between HBO Max and Annapurna Television, with Campos and Cohn as executive producers.
The Staircase will be written and directed by Antonio Campos (The Devil All the Time, The Sinner) and Maggie Cohn (American Crime Story), who serve as showrunners.
DeWitt will play Candace Zamperini, Kathleen Peterson’s sister, while Posey plays Freda Black, assistant district attorney and prosecutor in the Peterson case.